The real solution, for now, is to go to 10.4.7 instead (if you're not using a Sandbox, you can archive-and-install to your base version and update to 10.4.7 with a download).
I realize this is frustrating and annoying; we're doing our best at this end to come up with a workaround.
(The problem seems to be with threaded access to window updates; our progress indicator is set to update on its own thread, and the "main thread" updates too. But Core Graphics -- which handles the low level updating -- looks to be having a new problem with locking, and crashes either the main thread or the progress indicator thread when there's contention...)
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--Dave Nanian
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